Fire damper

A fire damper comprising:

• a frame;
• and
• a plurality of blades rotatably mounted to the frame such that each of the blades is rotatable about a respective rotational axis between an open rotational position and a closed rotational position, wherein for at least one of the blades the angle of rotation between the open rotational position and the closed rotational position is at least 100°, each of the blades comprising:
• at least one substantially planar portion;
• and
• a side edge portion which is curved away from a plane of the substantially planar portion,
• wherein a first curved side edge portion of a first of the blades is adapted to engage a second curved side edge portion of a second of the blades, adjacent the first, when the blades are in the closed position;
• and
• wherein the first curved side edge portion curves in an opposite direction to the second curved side edge portion when the first and second blades are engaged,
• wherein the first blade is provided with a resiliently flexible sealing member extending from the substantially planar portion of the first blade, the resiliently flexible sealing member adapted to abut a surface of the second blade when the blades are in the closed rotational position;
• and
• wherein the first blade is provided with a bimetallic strip, the bimetallic strip extending from the substantially planar portion of the first blade and configured to bend and overlap both the first and second blades when the first and second blades are in the closed rotational position.